# GPT-5.5 Pro vs Muse Spark 1.2

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 50.3 on the Noometry Index. Muse Spark 1.2 costs 34× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-5-pro-vs-muse-spark-1-2
- Last updated: 2026-10-12
- Shared benchmarks: 5

## Summary

- They share 5 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Muse Spark 1.2 in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 46.4.
- The biggest single-benchmark swing is CritPt: 30.6% for GPT-5.5 Pro and 17.7% for Muse Spark 1.2.
- Muse Spark 1.2 is cheaper at $1.25 / $4.25 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 1.05M.

## Snapshot

| | GPT-5.5 Pro | Muse Spark 1.2 |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 64.3 | 50.3 |
| Rank | 8 | 48 |
| Context | 1.05M | 1.05M |
| Input $/M | $30 | $1.25 |
| Output $/M | $180 | $4.25 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.5 Pro: —
- Muse Spark 1.2: 49.2 (#51)

| Benchmark | GPT-5.5 Pro | Muse Spark 1.2 |
|---|---|---|
| DeepSWE | — | 54.9% |
| LMArena WebDev | — | 1533 |
| FrontierSWE | — | 12% |
| SciCode | — | 56.4% |
| WeirdML | — | 60.3% |
| LMArena Coding | — | 1495 |

## Agentic & Tool Use

- GPT-5.5 Pro: —
- Muse Spark 1.2: 29.4 (#87)

| Benchmark | GPT-5.5 Pro | Muse Spark 1.2 |
|---|---|---|
| APEX-Agents | — | 36.4% |
| GDP.pdf | — | 16% |

## Reasoning

- GPT-5.5 Pro: 73.3 (#10)
- Muse Spark 1.2: 51.3 (#34)

| Benchmark | GPT-5.5 Pro | Muse Spark 1.2 |
|---|---|---|
| SimpleBench | 76.9% | 74.5% |
| CritPt | 30.6% | 17.7% |
| DTBench | 96% | 94.7% |
| LMCA | 53.9% | 48.4% |
| Epoch Capabilities Index | 162.07 | 154.87 |
| ARC-AGI-2 | 84.6% | — |
| NYT Connections (extended) | — | 79.2% |
| ARC-AGI-1 | 96.5% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1486 |

## Math

- GPT-5.5 Pro: 84.0 (#10)
- Muse Spark 1.2: 46.4 (#70)

| Benchmark | GPT-5.5 Pro | Muse Spark 1.2 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | — | 43% |
| LMArena Math | — | 1471 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |

## Knowledge

- GPT-5.5 Pro: 64.1 (#19)
- Muse Spark 1.2: 54.1 (#53)

| Benchmark | GPT-5.5 Pro | Muse Spark 1.2 |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| SimpleQA Verified | — | 60.3% |
| LMArena Expert | — | 1480 |

## Multimodal

- GPT-5.5 Pro: —
- Muse Spark 1.2: 43.4 (#25)

| Benchmark | GPT-5.5 Pro | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | — | 1305 |

## Multilingual

- GPT-5.5 Pro: —
- Muse Spark 1.2: 57.1 (#11)

| Benchmark | GPT-5.5 Pro | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | — | 1478 |
| LMArena Chinese | — | 1511 |
| LMArena French | — | 1513 |
| LMArena Russian | — | 1487 |
| LMArena Spanish | — | 1498 |

## Instruction Following

- GPT-5.5 Pro: —
- Muse Spark 1.2: 76.7 (#36)

| Benchmark | GPT-5.5 Pro | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | — | 1461 |

## Long Context

- GPT-5.5 Pro: —
- Muse Spark 1.2: 45.2 (#48)

| Benchmark | GPT-5.5 Pro | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | — | 1475 |

## Writing & Preference

- GPT-5.5 Pro: —
- Muse Spark 1.2: 72.3 (#14)

| Benchmark | GPT-5.5 Pro | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | — | 1482 |
| LMArena Creative Writing | — | 1449 |
| EQ-Bench Creative Writing | — | 1840 |
| LMArena Multi-Turn | — | 1494 |

## FAQ

### Is GPT-5.5 Pro better than Muse Spark 1.2?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 50.3 on the Noometry Index. Muse Spark 1.2 costs 34× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.5 Pro or Muse Spark 1.2?

Muse Spark 1.2 is cheaper. It lists at $1.25 per million input tokens and $4.25 per million output tokens; GPT-5.5 Pro lists at $30 and $180.

### Which has the bigger context window?

GPT-5.5 Pro does, with 1.05M tokens against 1.05M.

### How many benchmarks do GPT-5.5 Pro and Muse Spark 1.2 share?

5 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Muse Spark 1.2 has 31.